The maximum size of a JOB space is 268 MB. This holds true for a secondary page size
of 4096 bytes. A JOB instance supports up to 65535 JOB spaces.
Thus, you cannot store more than 17 TB in a JOB instance if you use a page size of 4096.

Invocation of methods JobCapable.readObject()
and
JobCapable.writeObject()
via reflection.
If there is a security manager,
the implementation must be granted ReflectPermission("suppressAccessChecks")
.